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Home >> Porsche >> 2019 >> Cayenne S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (39 Final Drive Differential, Differential Lock 3.0L -- 9YA - Cayenne (9YA)) >> WM, 397555 Replacing Rear-Differential Lock Control Unit >> Replacing Rear-Differential Lock Control Unit

Replacing Rear-Differential Lock Control Unit

WARNING: This page is about a different variant/trim than selected.
NOTE: Voltage drop 
  • Irreparable damage to control unit 
  • Damage to control unit 
  • Fault entries in the control unit 
  • Control unit programming/coding is aborted 
  • Malfunctions in the control unit, even during programming/coding 
    1. Switch off ignition before disconnecting the control unit.
    2. Make sure that the power supply is not interrupted during programming/coding.
    3. Connect the battery charger with at least > current 90 A  to the vehicle battery.

Information 

Ensure the consistency of a combination of hardware and software versions 

After performing software updates, always make sure that the target software versions are also actually installed on the control units and that the system is therefore ensured.

This also applies in the case of hardware replacement.

See TI 9X00 Information on the software system for various control units in the vehicle (112/21)

Information 

The PIWIS Tester  instructions take precedence since the description may be different with later Tester releases.

The procedure described here has been structured in general terms. Different text or additional information may appear on the PIWIS Tester  .

  1. Connect the Tester to the vehicle and start it. Switch on ignition.
  2. Select the vehicle type if necessary.
  3. Select the rear-differential lock  control unit in the overview  . Press F12 to continue. Is a "Vehicle Analysis Log (VAL)" to be created? Press F11 to continue.
  4. Select Coding/programming  .
  5. Select Automatic coding  . Press F12 to continue.
  6. 5.1 The tester displays the message: Coding successfully performed.
  7. Select Maintenance/repairs  .
  8. Commissioning  must be selected. Press F12 to continue.
  9. Read the warnings displayed on the Tester. Press F12 to continue.
  10. Follow the instructions on the Tester. Perform procedure according to menu guidance.
  11. Go back to the Overview  .
  12. In the overview  , press F7 to switch to the Additional menu  .
  13. Read out all fault memories  and delete any fault entries.
  14. Exit the diagnostic application. Switch off ignition. Disconnect the Tester from the vehicle.
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